couple of questions, he's limited to 1b, LF and possible RF,though no ideal, and perhaps DH, didn't check to see which league you were in. As said above, what are your current vL options at those places? Those are typically premium offensive positions, so he may not fit in above your current player who may be "ok" vs lefties, but much better vs right handed relievers late in the game.
If he can help you out looking at that, then call him up and get him 30+ starts. His vR & batting eye have improved a total of 1 point each thru the ST and 3 regular season check points. That's 4 opportunities to see an increase in his skills, and he didn't show any in those areas (though he improved each step in vL and contact), so I have to question how much improvement he has in those areas.